public bool AddSubCommand(CommandTable subCommand)
{
if (!subCommands.Any(arg => arg.command == subCommand.Command))
{
subCommands.Add(subCommand);
return(true);
}
return(false);
}
public Task <Result <object> > ExecuteCommand(string command)
{
if (executioners.Count != 0)
{
return(CallExecutioner(command));
}
var result = Result.Successful(null);
List <ExecutionGraphEntry> executionGraph = new List <ExecutionGraphEntry>();
var commands = command.Split(commandSeparator);
//loop through all the commands
for (int commandIteration = 0; commandIteration < commands.Count(); commandIteration++)
{
var trimmed = commands[commandIteration].TrimStart(argumentSeparator).TrimEnd(argumentSeparator);
var subCommands = commands[commandIteration].Split(subCommandSeparator);
string currentCommand = string.Empty;
CommandTable commandEntry = null;
//var commandWithArguments = trimmed.Split(argumentSeparator);
//if the command string is not long enough, fail
//split the command to its0 subcommands
for (int subCommandIteration = 0; subCommandIteration < subCommands.Count(); subCommandIteration++)
{
var trimmedSub = subCommands[subCommandIteration].TrimStart(argumentSeparator).TrimEnd(argumentSeparator);
var subCommandWithArguments = trimmedSub.Split(argumentSeparator);
if (subCommandWithArguments.Count() == 0)
{
return(ExecutionFailed("Invalid Command"));
}
if (subCommandIteration == 0)
{
currentCommand = subCommandWithArguments[0];
commandEntry = commandTable.Where(entry => entry.Command == currentCommand).FirstOrDefault();
if (commandEntry != null)
{
executionGraph.Add(new ExecutionGraphEntry(commandEntry.Callback, commandEntry.Rollback, subCommandWithArguments.Skip(1).ToList()));
}
//if the commandtable doesn't have a command match, fail
else
{
return(ExecutionFailed("Invalid Command"));
}
continue;
}
//if the subcommand string is not long enough, fail
if (subCommandWithArguments.Count() == 0)
{
return(ExecutionFailed("Invalid Command"));
}
commandEntry = commandTable.Where(entry => entry.Command == currentCommand)
.SelectMany(x => x.SubCommand)
.Where(cmd => cmd.Command == subCommandWithArguments[0])
.FirstOrDefault();
if (commandEntry != null)
{
executionGraph.Add(new ExecutionGraphEntry(commandEntry.Callback, null, subCommandWithArguments.Skip(1).ToList()));
}
//if no entries were found, fail
else
{
return(ExecutionFailed("Invalid Command"));
}
}
}
//execute the graph
return(Task <Result <object> > .Run(() =>
{
Stack <ExecutionGraphEntry> callstack = new Stack <ExecutionGraphEntry>();
Result <object> executionResult = Result.Ok <object>(null);
foreach (var entry in executionGraph)
{
if (!executionResult.Failure)
{
callstack.Push(entry);
executionResult = entry.Callback(this, entry.Arguments, executionResult.Value);
}
else
{
//fallback
foreach (var executedCommand in callstack)
{
if (executedCommand.Rollback != null)
{
executionResult = executedCommand.Rollback(this, entry.Arguments, executionResult.Value);
}
}
return Result.Failed("Command execution failed " + executionResult.Error, executionResult.Value);
}
}
return executionResult;
}));
}
